Describe the mechanics of breathing which cause inspiration at rest. (3)

The External intercostals contract and the diaphragm flattensPulling the thoracic cavity up and out This then increases the volume of the thoracic cavity, Causing a reduction of pressure in the lungs compared to atmospheric pressure.This produces airflow down the pressure gradient from an area of high to low pressure and into the lungs.

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Answered by Becky S. Physical Education tutor

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